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I just purchased a 20G long and I want to use an Aqua Clear filter. It's going to be a planted tank. I don't want too big a filter that will blow the c02 out. The 20 (Aqua Clear) looked too small--would a thiry be o.k. It' not going to be heavily stocked with fish. A school of white clouds and a few shrimp and about 3 cory cats. I plan to use excel, not dosing c02. HELP!
 

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On my 20L gallon I use the AquaClear 50...I believe it's rated at the most 200gph. You can adjust it for minimum 66 gph I believe. I have to check my instructions to be sure :)

That may be too much for what you want, but I wanted more filtration than less.
 

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its not so much the "power" of the filter that will gas off your Co2, rather the surface break.
i for one always suggest AquaClear filters. they are by far some of the best filters on the market. however, for a planted tank, your best bet is to go with a small canister (maybe like the Rapids mini/ TOM Aquatics brand)
 

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Good call on the AquaClear. They're great filters and the 30 should be good for your tank
 
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